成分差异对低成本热轧双相钢组织性能的影响
The Effect of Chemical Composition on Microstructures and Properties of Low Cost Hot-rolled Dual Phase Steel
狄国标
点击：3379次 下载：0次
作者单位：首钢技术研究院
中文关键字：热轧双相钢;三段式冷却;微合金元素;细晶强化
英文关键字：hot rolled dual phase steel;three steps cooling;microalloyed element;fine grain strengthing
中文摘要：实验室真空感应炉冶炼C-Mn钢，Nb-Ti钢和含Cr钢，轧后采用三段式冷却工艺试制低成本热轧双相钢，分析了成分差异对热轧双相钢组织性能的影响。结果表明，三种成分均可得到铁素体和马氏体双相组织；三者比较而言，C-Mn钢的铁素体含量较高，塑性好，但强度级别低；由于Nb-Ti钢中微合金元素Nb的固溶拖曳作用抑制相变，铁素体含量低，但细晶强化作用提高了钢板的屈服强度，屈强比增加；含Cr钢显微组织中马氏体含量最高，抗拉强度随之增高，屈强比较Nb-Ti钢降低。
英文摘要：Through vacuum induction furnace steelmaking of C-Mn steel, Nb-Ti steel and containing Cr steel, hot rolled dual phase steel experiment was carried out with the application of three steps cooling scheme and effect of chemical composition on microstructures and properties was analysed. Results demonstrated that ferrite and martensite dual phase microstructures could be obtained by three steps cooling scheme. By comparison, the obtained C-Mn dual phase steel was high in ferrite, and has an advantage in plasticity, but low in strength. Because of the inhibition of ferrite transformation by solid dissolved microalloying element Nb, Nb-Ti dual phase steel was low in ferrite, high in yield strength and yield ratio for its fine grain. Steel containing Cr had the highest content of martensite and high tensile strength, and lower yield ratio than Nb-Ti steel.